Metallic-filament incandescent lamp.



UNITED sTATEs `ieiggnirT oEEicE.

WILHELM MAJERT, F BERLIN, GERMANY.

METALLIC-FILAMINT IHSANDESCENT LAMP.

To all whom 'Lt may concern.'

Be it known that I, -WHLHELM MAJERT, a subject of the German Emperor, and resident of Berlin, Germany, have made certain .new and useful inventions Relating to Metallic-Filament Iiicandescent Lamps, of which the following a specification. taken in conncctionwith the accompanying drawine.

This inrentionrelates to metallic filament incandescent lamps and relates especially to incandescent lamps having filaments of brittle high fusing metals in which the lament member or loops are laterally sprung and heldvelastically by middle supports engagving their intermediate portions.

ln the accompanying drawing showing in a diagrammatic way several illustrative embodiments of this invention, Figure 'l is an elevation of a lamp. F ig. 2 shows a filament element before assembly. Fig. 3 is a projection indicating the filament arrangement in the lamp. Fig. l is a similar projection showing another tilainent arrangement.

-Suitable supports may be mounted in any desired way within the lamp bulb as for instance in the illustrative embodiment of this invention sli-own in Fig. 1 the bridge 10 and connected stem 11 within the bulb 15 may be of glass or other suitable material, the stem haring'a suitable crown 1Q in'which'the base supports '3 ot suitable high fusing metal may be mounted. The crown i3 of glass or similar material may carry the similar resilient middle supports -l having terminal eyesto encircle the tilaments at their intermediate portions and the crown 14 may be formed on the end of the stem 11 and have similar tip. supports 5 fused' or otherwise mounted therein which may be provided with substantially axially alined eyes to engage theflament, tips. The lamp may of course be provided with the usual central contact connected to the terminal l and the metallic base or socket member 16 connected to the terminal 2 issuing from the bridge;

While of course the filament elements may be of varied form, such assingle straight elements, V or Ushaped loops, the substantially V-shaped filament loops indicated in Figs. l and 2 may be used with advantage, the bend 6 at the tip being given suilicient curvature to avoid undesirable strain. These lilument members may be mounted by passing the free end 8 for example through one ofl the tip supports 5 and through the Specicaaon of Letters Patent.

Patented Feb. 15, 197410 Application tiled May 15, 1966. Serial No. 496,221.

corresponding middle support 4, while the other end 9 of the filament member is passed through the adjacent middle support as the tiiament is moved into position. The tilainfent ends may then be bent inward toward (nach other and placed ins'zidc the adjacent base supports 3 against which theyv are held bj. the 'resiliency of the filament which as indicated in Figs. 1 and 3 is sprung laterally at its intermediate portions so as to be elastically held by the resilient middle supports 4. The other filament members are snnilarly assembled in the supports and then the ends of the memberscemented and soidered or united to'cacii other and to the have supports 3 so as to form a substantially cylindreal filament structure in which the .single laver ofilament members are substantially uniformly arranged to gire a desirable lighting distribution, none of the filaments inzerseciing or crossing adjacent their mid portions.

course the filament members of a lamp ma' be sprung laterally toward or from each other and il' desired the filament loops' may be Ysprung inward at their interincdiate por.-

tioxs as indicated in Fig. 4. one of the tilament ends being passed through the tip support. 5 and through the proper middle support i while the other lilameui enel is passed through the corresponding middle support,

these ends being then separated so that they mar if desired be locked around the outside of ille base supports 3 to which they can be cemented and soldered. The tips 1f) of the assembled filaments are thus engaged by the tip .supports 3 while the intermediate portions 1T of the filamentsA are sprung inward, the ilament ends 18. 1S) being in contact with 'each other and with the base supports 3.

The filaments can in these ways be readily and quickly assembled and after the tilanwnts hare been placed in position the;vcan more readilyv be united or soldered to the supports and thereafter are much less liable to breakage because cla Vfically held at their intermediate portions h) the resilient suppols. h l

laaring described this invention 1n conneeiion with a number of illustrative embodiments thereof, to the details of which diswiosure the invention is not of course to bc iieniied, what is claimed as new and what is. desired to be secured by Letti-rs Parent is set forth in the appended -claims. 1. The incandescent lamp comprising a lll) axial fusing brittle metal haring their tips encircled by said tip supports having their Vard united with stem haring resilient hase supports, middle. supports and tip supports mounted thereon, V-shaped filament vloops of high fusing brittle metal having their tips encircled by said tip supports haring their intermediateportions encircled by said middle supports and thereby sprung outward and haring intermediate portions engaged by said middle supports and thereby sprung lat orally and haring their ends engaged by said base supports to form a substantiall)7 circular single' layer of non-intersecting filaments held in lateralliy sprung condition. j

3. The incandescent lamp comprising a stem having resilient base support` middle supports and tip supports mounted thereon and substantially V-shaped filament loops oihigh fusing brittle metal having their tips encircled by said tip supports haring their intermediate portions encircled by said middle supports and therein,-Y sprung out- -ward laterally" and having their ends resiliently held against said base supports and soldered thereto to be thereby joined in se- -ries and forni a substantiallyY c rlindrieal single layer of non-interseeting filaments elastieally. held in laterally sprungcondltion.

4. The

`ineandescent lamp comprising a stein hai-'ing base supports, tip supports and resilient middle supports mounted 'thereon and substantially Vshaped filament' loops of high fusing brittle metal haring their tips engaged by said tip supports having their intermediate portions` engaged by said middle supports and thereby sprung laterally and haring their ends engaged by and united to :said base supports to `form a substantiall)Y circular single layer of non-inter-l secting filaments in elastieally sprung condi-r tion. Y

5. The incandescent lamp comprising` base supports, tip supports and resilient middle supports, filament loops of high fusing brittle metal haring their tips engaged by aid tip supports having their intermediate portions engaged hy said middle supports and thereby sprung laterallyy and their ends engaged by said base supports to form a single layer of noxrinterst-cting lilaments in* elastically sprung condition.

6. The incandescent. lamp comprising base supports, vtip supports and middle supports and lilament loops of high fusing brittle metal haring their tip portions engaged by.

said tipsupports having` their intermediate portimis engaged by said middle supports and thereinv sprung' laterally and having their ends engaged by said base supports to form a substantially circular layer of elastically sprung filaments.

7. The. incandescent lamp comprising base supports, tip supports and middle supports and filament members of high fusing brittle metal engaged bylsaid tip .supports havin.r their intermediate portions engaged by said middle supports andlthereby sprung laterally and having their ends engaged by said base supports to form a substantially cylindrical single layer of noir-intersectingr filaments in laterally sprung condition.

S- 'l`heincandescent lamp comprising base supports, `tip supports and middle supports and filament members metal engaged by said tip supports having their intermediate portions engaged by said middle supports and thereby sprung laterally and engaged by said base supports to form a single layer of non-intersecting laterally sprung filaments. Y Y lVILHllLM MAJERT.

Tllfitnesses z Hanni' L. DUSCK, Jessie B. KAY.

ot' high fusing brittle 

